Ce diaporama a bien été signalé.
Nous utilisons votre profil LinkedIn et vos données d’activité pour vous proposer des publicités personnalisées et pertinentes. Vous pouvez changer vos préférences de publicités à tout moment.

Charging and Discharging Objects

Livres associés

Gratuit avec un essai de 30 jours de Scribd

Tout voir

Livres audio associés

Gratuit avec un essai de 30 jours de Scribd

Tout voir
  • Soyez le premier à commenter

Charging and Discharging Objects

  1. 1. Charging and Discharging Objects
  2. 2. <ul><li>An electroscope is a device that allows you to test whether an object is charged </li></ul><ul><li>The main parts of an electroscope are a metal ball , a metal rod and metal leaves </li></ul>Electroscopes metal ball metal rod metal leaves
  3. 3. <ul><li>The ball, rod and leaves are all conductors </li></ul><ul><li>Conductors allow electrons to move easily through them </li></ul>Electroscopes metal ball metal rod metal leaves
  4. 4. Electroscopes <ul><li>When the electroscope is neutral , the leaves stay together </li></ul>+ - + - + - + - + + - + - + - + - + - + - + - + - + - + - + - + - + - - + -
  5. 5. Electroscopes <ul><li>When the electroscope is positively or negatively charged , the leaves repel each other (separate) </li></ul>+ - + - + - - - - - - - - - - - - - - + - + - + - + + + + + + + + - + -
  6. 6. <ul><li>When a neutral object is touched by a charged object, some of the charge transfers to the neutral object and the neutral object becomes charged . </li></ul>Charging By Contact <ul><li>- - - - - - - - - - </li></ul><ul><li>- </li></ul><ul><li>- - - - - - - - - </li></ul><ul><li>- - - - - - - </li></ul><ul><li>- - - - - - - </li></ul>- - - - -
  7. 7. <ul><li>When a negatively charged object touches a neutral object, electrons move to the neutral object making it negative </li></ul>Charging By Contact <ul><li>- - - - - - - - - - </li></ul><ul><li>- </li></ul><ul><li>- - - - - - - - - </li></ul><ul><li>- - - - - - - </li></ul><ul><li>- - - - - - - </li></ul>- - - - - ebonite rod
  8. 8. <ul><li>When a positively charged object touches a neutral object, electrons move from the neutral object to the positive object and make the neutral object positive </li></ul>Charging By Contact + + + + + + + + + + + + + + + + + + - + - + - + + + + - - + - + - + - + - + + + + + + + + - - - - acrylic rod
  9. 9. <ul><li>When an insulating material is charged by contact, the charge stays on the insulator at the point where it is touched </li></ul>Charging By Contact
  10. 10. <ul><li>When a conducting material is charged by contact, the charge spreads out over the whole surface of the conductor. </li></ul>Charging By Contact
  11. 11. <ul><li>Induction is the movement of electrons within a substance, caused by a nearby charged object, without direct contact </li></ul>Induction
  12. 12. <ul><li>If you rub a rubber balloon on your hair, electrons will transfer from your hair to the balloon, making the balloon negative </li></ul>Induction
  13. 13. <ul><li>When you bring the negatively charged balloon near a neutral wall, the electrons on the balloon repel the negative charges on the wall, making that part of the wall positive </li></ul>Induction
  14. 14. <ul><li>The balloon is said to induce a charge on the wall because it charges the wall without contacting it </li></ul>Induction
  15. 15. <ul><li>Grounding is the process of connecting a charged object to the Earth’s surface </li></ul>Grounding (Symbol for grounding)
  16. 16. <ul><li>When you connect a charged object to the ground, you provide a path for charges to travel to or from the ground </li></ul>Grounding
  17. 17. <ul><li>When you charge an object by induction , you use a charged object to induce a charge in a neutral object </li></ul><ul><li>Then you ground the newly charged object so that it retains the charge </li></ul>Charging By Induction
  18. 18. Charging By Induction <ul><li>Step 1 : </li></ul><ul><li>When a negatively charged object comes near a neutral electroscope, it repels the electrons in the neutral electroscope </li></ul>
  19. 19. Charging By Induction <ul><li>Step 2 : </li></ul><ul><li>When you ground the neutral electroscope, you provide its electrons with a path away from the repulsive influence. Some electrons leave the electroscope. </li></ul>
  20. 20. Charging By Induction <ul><li>Step 3 : </li></ul><ul><li>When you remove the ground and the charged object, the electroscope is left with a positive charge because it has lost some electrons </li></ul>
  21. 21. Charging By Induction <ul><li>Step 1 : </li></ul><ul><li>When a positively charged object comes near a neutral electroscope, it attracts the electrons in the neutral electroscope </li></ul>
  22. 22. Charging By Induction <ul><li>Step 2 : </li></ul><ul><li>When you ground the neutral electroscope, you provide a path for electrons to go toward the positive influence. </li></ul>
  23. 23. <ul><li>Step 3 : </li></ul><ul><li>When you remove the ground and the charged object, the electroscope is left with a negative charge because it has gained some electrons </li></ul>Charging By Induction
  24. 24. <ul><li>Once an object is charged , the charges are trapped on it until they are given a path to escape </li></ul><ul><li>When electric charges are transferred very quickly , the process is called an electrical discharge </li></ul>Electrical Discharge
  25. 25. <ul><li>Sparks are an example of electric discharge </li></ul>
  26. 26. <ul><li>Lightning is an example of a very large electrical discharge caused by induction </li></ul>Electrical Discharge
  27. 27. Lightning
  28. 28. Lightning <ul><li>Lightning can strike up to 15km from where it is raining </li></ul><ul><li>If you can hear thunder , you are in striking distance </li></ul><ul><li>Safe shelter includes large buildings or vehicles (provided the windows are rolled up and you do not touch metal parts of the vehicle) </li></ul>
  29. 29. Lightning <ul><li>Avoid the highest point of land (e.g. under a tree) because lightning tends to strike these areas </li></ul><ul><li>Stay away from objects that conduct electricity (e.g. bicycles, golf clubs, lawn mowers etc.) </li></ul>

    Soyez le premier à commenter

    Identifiez-vous pour voir les commentaires

  • vavski

    Oct. 16, 2016
  • MarkDalit1

    Nov. 8, 2016
  • sheerhiza

    Jan. 2, 2017
  • OKPOBOKPOB

    Feb. 7, 2017
  • yrrehcbernal

    Jul. 6, 2017
  • BonangMotsapi

    Aug. 4, 2017
  • sfatimahnorizan

    Sep. 14, 2017
  • joannedavies

    Oct. 24, 2017
  • dianasandoval1042032

    Nov. 12, 2017
  • MalakDia

    Dec. 11, 2017
  • HmasrDas

    Dec. 27, 2017
  • mohitbehal

    Feb. 10, 2018
  • QuynhVanLe

    Mar. 5, 2018
  • isaiahimomoh

    Mar. 29, 2018
  • dinaammar

    May. 8, 2018
  • Vinayrocklm10

    Jan. 30, 2019
  • VictoriaAmuchechi

    Jun. 26, 2019
  • kimiiwhieee

    Jan. 6, 2020
  • TarekElsayed24

    Jun. 19, 2020
  • KishoreK91

    Feb. 25, 2021

Vues

Nombre de vues

18 531

Sur Slideshare

0

À partir des intégrations

0

Nombre d'intégrations

411

Actions

Téléchargements

0

Partages

0

Commentaires

0

Mentions J'aime

27

×